Only a day after the Million Reasons singer revealed her battle with PTSD, the A-lister once again opened up about her life with the mental illness — only this time in a letter for her Born This Way Foundation's website.

While at the center, the blonde brought gifts for the people she met, and opened up to them about her mental health struggles, saying:

"I don't have the same kinds of issues that you have, but I have a mental illness, and I struggle with that mental illness every day. So, I need my mantra to help keep me relaxed."

During an interview for that same segment, the 30-year-old revealed her mental illness, explaining:

"I told the kids today I suffer from a mental illness — I suffer from PTSD. I've never told anyone that before, so here we are."

The brave announcement comes just two years after she confessed she had been raped at 19 years old. But, she took to Twitter on Tuesday to insist that's not the only experience that caused the disorder, saying:

Lady GaGa has been changing up her look lately by wearing cutoffs and country-inspired dresses, but on Tuesday in London she went back to her old ways in a dominatrix-looking Gianni Versace getup that revealed plenty of skin.

First there was Gigi, completely slaying in a silver Versace jumpsuit with long train that gave the already dramatic look additional flair. Paired with strappy Dsquared2 sandals, the ensem couldn't have been more spectacular!

Second we had GaGa, looking like a queen in a black gown with voluminous bustle that had royalty written all over it. We love that she can go from funky to polished so easily!

Finally there was Karlie, looking sleek and modern in an hourglass Stella McCartney gown that hugged her body tight. Loose hair, Atelier Swarovski jewelry, and an orange-red lip finished off the look.

"My metabolism actually changed like crazy this year. I have Hashimoto's disease. It's a thyroid disease, and it's now been two years since taking the medication for it, so for the VS show I didn't want to lose any more weight, I just want to have muscles in the right place, and if my butt can get a little perkier, then that's good."